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Título

SEVEN TUNNELS TO THE GREATER VITORIA AND THEIR GEOTECHNICAL ASPECTS

Resumo

The population increase of the cities is followed by demands for new urban infrastructures which are responsible to allow its
sustainable economic growth and ensure quality of life. Vitória, is the Espírito Santo (ES) state capital, an island densely populated, important considering its harbor areas. Alone, ES exports more than 60% of the iron ore, more than 75% of the dimension (ornamental) stone for finishings exported of the country, and it has become the second in petroleum production, with an average of 355,000 barrels per day (Petrobras, 2015). This intense economic scenario leads to a much greater GDP than the national average. Vitória has been demanding new road connections with its neighbor cities: Vila Velha and Cariacica, both part of the conurbation of its grater urban area, as well some arterial systems has their own demands to enhance quality of traffic and allow time savings on transit trips. In this paper presents 7 tunnels for the Greater Vitória. Two imersed solutions are explored and presented, describing theis geotecnhical aspects of the Vitória Bay. For the so called fourth connection between Vitória and Cariacica, the local government disclosed a conceptual bridge project, 36 m wide and 1,4 km length. As an alternative proposal for the Vitória and Cariacica link under the Vitória Bay channel it’s presented an immersed tunnel solution. However, neither ES nor Vitória have any tradition in tunnel construction for road infrastructure. Kneib & Prandina (2004) presented an immersed tunnel proposal between Vitória and Vila Velha and the geotenchical aspects of these two immersed solutions are pictured in details. Prandina (2013) presented the Cristovan Jaques tunnel to connect the Reta da Penha avenue to the Castelo Branco bridge adopting the cut-and-cover method. The west ot the Vitória island, where Serafim Derenzi avenue develops recall two other tunnels through a rock massif to reduce distance and increase road safety. A 6th a major solution which cuts through the central massif of the Vitória island, a NATM tunnel is detailed and, with similar geotecnical aspects and challenge to the previou last cited 2 tunnels. The 7th tunnel connects two parts of the Cesar Hilar avenue. Many factors indicate that the tunnels described to enhance the arterial systems of the road nework of Vitória are best solutions. The cost of the construction of each solution are assessed with respect the international and the local costs of each one.

Palavras-chave

tunnel
vitória
immersed tunnel
natm

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